diff --git a/dockerfile/README.md b/dockerfile/README.md
index efcc461..87702b5 100644
--- a/dockerfile/README.md
+++ b/dockerfile/README.md
@@ -3,5 +3,6 @@ docker run -it -d --rm --name epivar2 -v "$PWD/xiao_data/":/project/ epi12 pytho
 
 ## use singularity and qsub on cluster
 singularity pull docker://huanleliu/epi12
+
 singularity exec -e /full/path/to/epi12_latest.sif python3 /usr/local/bin/EpiNano/Epinano_Variants.py -R /path/to/ref.fa -b /path/to/reads.bam -s /usr/bin/EpiNano/misc/sam2tsv.jar -n 2